Nut-lock.



Patented Dec. [9, I899. .1. A. OVERALL.

NUT LOCK.

(Application filed July 17, 1899.)

(No llodol.)

p WITNESSES: M

UNITED STATES ATENT FICE JOHN A. OVERALL, OF DE LASSUS, MISSOURI,ASSIGNOR OF ONE-HALF TO AUGUSTUS W. KINZER, OF SAME PLACE.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent N 0. 639,607, datedDecember 19, 1899.

Application filed July17, 1899. Serial No. 724,077. (No model.)

To all whom it may concern:

Be it known that I, JOHN A. OVERALL, a citizen of the United States,residing at De Lassus, in the county of St. Francois and State ofMissouri, have invented new and useful Improvements in Nut-Locks, ofwhich the following is a specification.

My invention relates to nut-locks principally designed for connectingthe ends of railroad-rails, which rails, owing to the vibrations causedby passing trains and to contraction and expansion due to changes intemperature, frequently cause the nuts to Work loose. The invention,however, is adapted for use generally wherever it is desired to look anut to a bolt, so as to prevent backward movement of the nut.

The object of the invention is to provide an improved construction ofnut -lock which shall possess superior advantages with respect toefficiency in use.

The invention consists in the novel construction and combination ofparts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal section showinga bolt provided with my improved nut-lock. Fig. 2 is a perspective viewshowing the nut with the locking devices removed. Fig. 3 is aperspective View of one of the segmental arms and wedges. Fig. 4 is asimilar view of the plug provided with the sharpened ribs or teeth.

In the said drawings the reference-numeral 1 designates a bolt of anyordinary or suitable construction, screw-threaded, as usual.

The numeral 2 designates the nut, comprising the angular portion 3 andround head or inner end 4:. This nut is formed with interiorscrew-threads, as usual. Formed in the inner face of said nut is acircular groove 5, provided with two opposite intersecting recesses orsockets 6.

The numeral 7 designates one of two segmental arms adapted to seat insaid groove at opposite sides thereof, each of which is provided with alug 8, the inner face of which is beveled, so as to form a wedge. Thetwo wedges thus formed engage with the recesses or sockets when the armsare forced in the groove. 7

The numeral 9 designates two metal plates or plugs, the inner sides ofwhich are formed with sharpened ribs or teeth which are adapted toengage with the threads of the bolt.

In practice the segmental arms are seated 5 5.

in the groove in the nut with the wedge of each located in the saidrecesses, and the plugs are also seated in said recesses, but projectslightly beyond the face of the nut. The nut is then screwed on the boltuntil it has about reached the limit of its movement, when the plugswill be forced between the said wedges and bolt. The wedges now actingon the outer sides of the plugs or plates will force them inward,causing the ribs or teeth to bite into the threads of the bolt, wherebythe nut will be held securely in place and backward movement orloosening of the same be prevented.

Having thus fully described my invention, what I claim is In a nut-lock,the combination with the nut formed with a groove in its inner face withopposite intersecting recesses or sockets, of the segmental armsprovided with wedges seated in said recesses or sockets, and the plugsor plates formed with ribs or teeth also seated in said recesses andbearing against said wedges, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN A. OVERALL. Witnesses:

.THEO. D. FISHER, O. O. BRAFFET.

